Photography "shoe"
You pull the paper in the dark and one proceeds to development which consists of immersing the sheet in a bath of liquid development prepared according to the instructions of the manufacturer and for the time indicated by these. Everything is done in the dark with the light bulb with a special red or greenish yellow for photographic uses. Elapsed time or when it seems that the image is good you pull the paper and rinse quickly under the water ... and then plunges into a second tank with the fixing bath for the time indicated by the manufacturer that we have also explained the method of preparation of the bath itself.
Remember: everything in the dark and following the instructions provided by the manufacturer of developing and fixing baths